Use of shilajatu

Tin, lead, iron, copper, silver and gold are the six metals named as the sources (yoni) of shilajatu, and shilajatu from each later metal has more virtue than the one before. It is taken by rule with triphala decoction, milk and ghee in great disorders of kapha, pitta and vata; the verse calls it the lord of rasas, a maker of gold and a medicine for all diseases. A footnote explains that the metals in mountain rock melt in the heat and become shilajatu.